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Unformatted text preview: 1 1. Hallux abducto valgus (called HAV) is a deformation of the big toe that is not common in youth and often requires surgery. Metatarsus adductus (called MA) is a turning in of the front part of the foot that is common in adolescents and usually corrects itself. Doctors used Xrays to measure the HAV angle (in degrees) of deformity as well as the MA angle (in degrees) in 37 patients under the age of 21 who came to a medical center for surgery to correct HAV. Doctors speculate that the severity of MA can help predict the severity of HAV. 2 Scatterplot of angle of MA by angle of HAV Simple linear regression results: Dependent Variable: hav Independent Variable: ma hav = 17.634 + 0.413 ma Sample size: 36 R (correlation coefficient) = 0.44 Rsq = 0.19 3 1. Using angle of MA to predict angle of HAV a) Describe form, direction and strength of the relationship between MA angle and HAV angle. Scatterplot of angle of MA by angle of HAV 4 1. Using angle of MA to predict angle of HAV a) Describe form, direction and strength of the relationship between MA angle and HAV angle. Scatterplot of angle of MA by angle of HAV Form: linear Direction: positive Strength: moderately strong 5 1. Using angle of MA to predict angle of HAV Slope tells us the average change in “Y” for every one unit increase in “X.” X = ? One unit in X = Y = ? b = ? c) Interpret slope in context. (hav = 17.634 + 0.413 ma ) 6 1. Using angle of MA to predict angle of HAV Slope tells us the average change in “Y” for every one unit increase in “X.” X = ma angle in degrees One unit in X = one degree Y = hav angle b = 0.413 c) Interpret slope in context. (hav = 17.634 + 0.413 ma ) 7 1. Using angle of MA to predict angle of HAV a. For each one degree increase in the angle of MA, the angle of HAV increases by 0.413 degrees on average. b. For each one degree increase in the angle of HAV, the angle of MA increases by 0.413 degrees on average. c. For each 0.413 degrees increase in the angle of MA, the angle of HAV increases by 17.634 degrees on average. d. For each 17.634 degrees increase in the angle of MA, the angle of HAV increases by 0.413 degrees on average. c) Interpret slope in context. (hav = 17.634 + 0.413 ma ) 8 1. Using angle of MA to predict angle of HAV a. For each one degree increase in the angle of MA, the angle of HAV increases by 0.413 degrees on average. b. For each one degree increase in the angle of HAV, the angle of MA increases by 0.413 degrees on average. c. For each 0.413 degrees increase in the angle of MA, the angle of HAV increases by 17.634 degrees on average. d. For each 17.634 degrees increase in the angle of MA, the angle of HAV increases by 0.413 degrees on average....
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This note was uploaded on 12/03/2011 for the course PHYSICAL S 100 taught by Professor Allred during the Summer '10 term at BYU.
 Summer '10
 ALLRED

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